Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
filosofica da » filosofia da, filosofia de, filosofia di
filosofia la » filosofia da, filosofia le, filosofia das
test duale » test double, test delle, test orale
studien di » studien die, studien dd, studien der

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "test duale studien di ((filosofia la) OR (filosofica da)) literatura".
• Adding a wildcard symbol may retrieve word variants: test duale studien di ((filosofia la) OR (filosofica da)) literatura*.